Opening and closing means for carton boxes



Jan. 16, 1934. c. w. HARTMANN OPENING AND C LOSINSE' MEANS FOR CARTON BOXES Filed April v27, 1931 F EA- 5777M Patented Jan. 16, 1934 UNITED v STATES OPENING AND CLOSING MEANS FOR CARTON BOXES Carl Wilhelm Hartmann, Lyngby by Copenhagen, Denmark Application April 27, 1931, Serial No. 533,311, and Denmark May 2, 1930 1 Claim. (Cl. 229-51) The invention relates to box shaped cardboard or like packings for gritty, pulverized or semiliquid goods, for instance dealt within the grocery line, and as a rule, destined for being mechanically filled, at factories or main stocks, in current retail quantities, so that repacking by the retail sales may be avoided, the buyers thus enjoying full security as to the quality of the goods.

The object of the invention is to thus arrange this kind of packings, or original packings, that after opening there may be taken from the contents now and then without complicated opening and closing operations and without contaminating the contents.

The invention consists chiefly in that the cardboard of the packing or box or the like, by scratching, perforating or the like, is lineally weakened at a suitable distance from the one end or side of the box, or if desired weakened in that manner at a suitable distance from both ends or opposite sides, so that, by a wrenching, tearing or cutting operation the one end or side of the box may easily be removed, which end or side then presents a lid, the height of which corresponds to 2 said distance.

Further the cardboard is provided, on one or several sides, with yielding parts produced by grooves, notches or the like of a certain length issuing from, and as a rule perpendicular to, the

plan of the weakening described, so that the said side or sides of the box, upon removalof the lid like box part, may easily be bent inwardly and hence the mouth of the box main part be dimin ished to an extent that the removed box part may be put on it as a snugly fitting lid.

The invention is illustrated on the drawing, by way of an example, applied to a box of rectangular cross section.

Figs. 1 and 2 show in perspective the box before 9 and after opening respectively.

Figs. 3 and 4 are fragmentary sectional views of the upper portion of the box showing, respectively, the cover partially and completely removed.

The lineal weakening shown in Fig. l, is a perforation 3 at a suitable distance from the top of the box, so as to leave, between the top and the perforation 3, side portions 5 of a height corresponding to the flange of a lid'of convenient proportions. Notches 6 on the narrow sides I extend downwardly from the perforation 3 to suitably low situated points.

when the box is to be opened, the part 4, 5 is removed through wrenching, tearing or cutting, and after having taken a portion of the contents of the box somewhat corresponding to the box part removed, the upper ends of the narrow sides are bent inwardly by pressing on the notches 6. The box part 4, 5'may then be put on the box mQin part 8 as a lid asshown in Fig. 2.

The goods in question, as for instance sago the like,

powder, cacao, dry milk, mustard or the like, may in this manner be kept stored by the consumer without repacking and may always remain easily accessible and well protected.

Cartons of the present kind are in most cases provided with an inner bag or lining 10 of a dust tight or even water tight material, chemically indifferent to a certain extent, if necessary. In the case of weakening by perforation, the perforation is to be made before the attaching of the lining upon or inside the carbon, so that the tightness of the lining does not become harmed. In the case of pasting the bags or linings upon the cartons a strip of paste is applied to the lining along the line of the weakening 3 as shown at 9 in Fig. 1, in order to secure that upon tearing oil the box part 4, 5, the lining itself is regularly torn oil after the weakening line so that any free lining parts, necessitating extra operations at each taking from the contents of the box, are avoided.

In lieu of the box part 4, 5 or the lid retaining its original width, while the mouth of the box main part 8 being reduced as above described, the mouth of the main part may retain its original width, while the lid is destined to be extended so as to externally fit the mouth, or to be retracted so as to inwardy fit same.

0n the whole the details shown and described are examples only, as above stated, and may be altered in different manners without departing from the scope of the invention. In lieu of real weakenings through perforations, scratchings or lines for marking a cutting plan may in some cases prove to be suflicient. Further in lieu of the notches, groovings or the like, simple markings of a pressure point may in some cases prove suflicient too. Markings of this kind may in same cases be made on the label of the box.

What I claim is:-

In cartons of the kind referred to, a carton body having a weakened portion enabling the carton to be separated into main and lid parts along the line of the weakened portion, yielding means permitting the main part to be deformed in the vicinity of the weakened portion, a loose inner lining fitted in said body, said lining having only that portion thereof overlying the weakened portion of the body locally pasted directly to said weakened portion, whereby incident to the separation of the body, the lining is broken along the weakened portion.

CARL WILHELM HARTMANN'. 

